Although the FORWARD_IPV4 parameter of /etc/sysconfig/network disappeared
in RHL 6.2 (now in /etc/sysctl.conf), it is still described in the manual.
(I didn't chech whether /etc/sysctl.conf is described or not.)
(Don't know if I selected the right package for this bug report.)
The Official Red Hat Linux Reference Guide no longer mentions use of the
FORWARD_IPV4 value in /etc/sysconfig/network. Note that the bug was filed for
the Installation Guide, but the originator of the bug wasn't sure of the
package, which should have been rhl-rg.